1221213022223 has 4 divisors (see below), whose sum is σ = 1223244991248. Its totient is φ = 1219181053200.

The previous prime is 1221213022207. The next prime is 1221213022279. The reversal of 1221213022223 is 3222203121221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221213022223 - 2⁴ = 1221213022207 is a prime.

It is a super-2 number, since 2×1221213022223² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221213022423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015983611 + ... + 1015984812.

It is an arithmetic number, because the mean of its divisors is an integer number (305811247812).

Almost surely, 2^{1221213022223} is an apocalyptic number.

1221213022223 is a deficient number, since it is larger than the sum of its proper divisors (2031969025).

1221213022223 is an equidigital number, since it uses as much as digits as its factorization.

1221213022223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031969024.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1221213022223 its reverse (3222203121221), we get a palindrome (4443416143444).

The spelling of 1221213022223 in words is "one trillion, two hundred twenty-one billion, two hundred thirteen million, twenty-two thousand, two hundred twenty-three".